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Effects of parental ploidy level and genetic divergence on chromosome elimination and chloroplast segregation in somatic hybrids within Brassicaceae

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Summary

Chromosome and organelle segregation after the somatic hybridization of related species with different degrees of genetic divergence were studied by comparing the interspecific somatic hybrids Brassica oleracea (CC) (+) B. campestris (AA), B. napus (AACC) (+) B. oleracea (CC) B. napus (AACC) (+) B. nigra (BB) and B. napus (AACC) (+) B. juncea (AABB) with the intergeneric somatic hybrids B. napus (AACC) (+) Raphanus sativus (RR) and B. napus (AACC) (+) Eruca sativa (EE). Within each combination, some hybrids were found whose DNA content was equal to the sum of parental chromosomes, others had a relatively higher DNA content and in most of the cases, some had a relatively lower content. However, the frequency distribution in these three classes differed significantly between the combinations. A positive correlation between the frequency of hybrids with eliminated chromosomes and the genetic distance between the species in each combination was found. Furthermore, by combining species with different ploidy levels we found a significantly higher degree of chromosome elimination compared to combinations of species with the same ploidy level. In the B. napus (+) B. Nigra, B. napus (+) R. sativus and B. napus (+) E. sativa combinations chromosomes from the B, R and E genomes appeared to be preferentially sorted out, as indicated by the fact that some of the nuclear markers from these genomes were missing in 7–46% of the plants, whereas no plants were lacking B. napus nuclear markers. Fertile hybrids were found in all but the B. napus (+) R. sativus fusion combination; the latter hybrids were male sterile, but female fertile. Hybrids between the A and C genomes were more fertile than hybrids obtained between the distantly related AC and B, R or E genomes, respectively. Analysis of the chloroplast RFLP pattern revealed that chloroplasts in the B. oleracea (+) B. campestris hybrids segregated randomly. A slightly biased segregation, favouring B. napus chloroplasts, was found in the B. napus (+) B. oleracea combination, whereas B. napus chloroplasts were strongly selected for in the B. napus (+) B. juncea, B. napus (+) B. nigra, B. napus (+) R. sativus and B. napus (+) E. sativa somatic hybrids.

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Authors and Affiliations

  1. Department of Plant Breeding, Swedish University of Agricultural Sciences, Uppsala, Sweden

    E. Sundberg & K. Glimelius

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  1. E. Sundberg
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  2. K. Glimelius
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Communicated by G. Wenzel

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Sundberg, E., Glimelius, K. Effects of parental ploidy level and genetic divergence on chromosome elimination and chloroplast segregation in somatic hybrids within Brassicaceae . Theoret. Appl. Genetics 83, 81–88 (1991). https://doi.org/10.1007/BF00229229

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  • DOI: https://doi.org/10.1007/BF00229229

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